Attempt to reproduce Direct access to Nova metadata per Lars Kellogg-Stedman
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              | Quoting  http://blog.oddbit.com/2014/01/14/direct-access-to-nova-meta... 
In an environment running Neutron, a request from your instance must traverse a number of steps:
    From the instance to a router,
    Through a NAT rule in the router namespace,
    To an instance of the neutron-ns-metadata-proxy,
    To the actual Nova metadata service |  |  
When there are problem accessing the metadata, it can be helpful to verify that the metadata service itself is configured correctly and returning meaningful information. Full Story | 
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